/*-
 *  * Copyright 2016 Skymind, Inc.
 *  *
 *  *    Licensed under the Apache License, Version 2.0 (the "License");
 *  *    you may not use this file except in compliance with the License.
 *  *    You may obtain a copy of the License at
 *  *
 *  *        http://www.apache.org/licenses/LICENSE-2.0
 *  *
 *  *    Unless required by applicable law or agreed to in writing, software
 *  *    distributed under the License is distributed on an "AS IS" BASIS,
 *  *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  *    See the License for the specific language governing permissions and
 *  *    limitations under the License.
 */

package org.datavec.local.transforms.functions.data;


import org.apache.commons.io.IOUtils;
import org.datavec.api.writable.BytesWritable;
import org.datavec.api.writable.Text;
import org.nd4j.linalg.function.Function;
import org.nd4j.linalg.primitives.Pair;

import java.io.IOException;
import java.io.InputStream;

/**A PairFunction that simply loads bytes[] from a a PortableDataStream, and wraps it (and the String key)
 * in Text and BytesWritable respectively.
 * @author Alex Black
 */
public class FilesAsBytesFunction implements Function<Pair<String, InputStream>, Pair<Text, BytesWritable>> {
    @Override
    public Pair<Text, BytesWritable> apply(Pair<String, InputStream> in) {
        try {
            return Pair.of(new Text(in.getFirst()), new BytesWritable(IOUtils.toByteArray(in.getSecond())));
        } catch (IOException e) {
            throw new IllegalStateException(e);

        }

    }
}
